
\begin{table}[htb]
\caption{Robustness check: Table F1 with additional control variables and country-fixed effects}
\begin{center}
\begin{tabular}{l c c c}
\hline
 & Experiment 1 & Experiment 2 & Experiment 3 \\
\hline
Citizens                   & $1.34^{*}$        & $2.40^{*}$        & $-1.31^{*}$       \\
                           & $ [ 1.01;  1.68]$ & $ [ 2.06;  2.74]$ & $ [-1.76; -0.86]$ \\
Benefits                   &                   &                   & $4.24^{*}$        \\
                           &                   &                   & $ [ 3.78;  4.70]$ \\
Citizens $\times$ Benefits &                   &                   & $1.32^{*}$        \\
                           &                   &                   & $ [ 0.70;  1.93]$ \\
Age                        & $-0.01$           & $-0.03^{*}$       & $-0.01$           \\
                           & $ [-0.02;  0.01]$ & $ [-0.04; -0.01]$ & $ [-0.02;  0.01]$ \\
Male legislator            & $0.21$            & $0.43^{*}$        & $0.24$            \\
                           & $ [-0.15;  0.58]$ & $ [ 0.06;  0.80]$ & $ [-0.10;  0.57]$ \\
Left-right ideology        & $0.24^{*}$        & $0.25^{*}$        & $0.24^{*}$        \\
                           & $ [ 0.11;  0.38]$ & $ [ 0.12;  0.39]$ & $ [ 0.12;  0.36]$ \\
Trustee vs. delegate       & $0.37^{*}$        & $0.46^{*}$        & $0.49^{*}$        \\
                           & $ [ 0.20;  0.55]$ & $ [ 0.28;  0.63]$ & $ [ 0.33;  0.65]$ \\
Government party           & $0.42^{*}$        & $0.12$            & $0.36^{*}$        \\
                           & $ [ 0.07;  0.76]$ & $ [-0.22;  0.47]$ & $ [ 0.05;  0.67]$ \\
Single member districts    & $0.46^{*}$        & $0.39$            & $0.05$            \\
                           & $ [ 0.06;  0.86]$ & $ [-0.01;  0.79]$ & $ [-0.31;  0.42]$ \\
Upper chamber              & $-0.47^{*}$       & $-0.26$           & $-0.27$           \\
                           & $ [-0.87; -0.06]$ & $ [-0.66;  0.15]$ & $ [-0.64;  0.10]$ \\
First term legislator      & $0.00$            & $-0.16$           & $0.18$            \\
                           & $ [-0.36;  0.36]$ & $ [-0.52;  0.20]$ & $ [-0.14;  0.51]$ \\
Intercept                  & $4.36^{*}$        & $3.78^{*}$        & $2.81^{*}$        \\
                           & $ [ 3.33;  5.38]$ & $ [ 2.75;  4.81]$ & $ [ 1.85;  3.78]$ \\
\hline
R$^2$                      & $0.15$            & $0.27$            & $0.60$            \\
Adj. R$^2$                 & $0.14$            & $0.26$            & $0.59$            \\
Num. obs.                  & $789$             & $789$             & $789$             \\
\hline
\multicolumn{4}{l}{\scriptsize{\parbox{0.85\linewidth}{$^*$ Null hypothesis value outside the 95\% confidence interval. Entries are unstandardized coefficients from a linear mixed-effect regression model. Bootstrapped confidence intervals in parentheses. Countries function as groups. Support for PTAs is captured on an 11-point scale.}}}
\end{tabular}
\label{tab:tableM2}
\end{center}
\end{table}
